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y in (-oo:+oo)
(3*(y-5))/5 = -4 // + 4
(3*(y-5))/5+4 = 0
(3*(y-5))/5+(4*5)/5 = 0
3*(y-5)+4*5 = 0
3*y+5 = 0
(3*y+5)/5 = 0
(3*y+5)/5 = 0 // * 5
3*y+5 = 0
3*y+5 = 0 // - 5
3*y = -5 // : 3
y = -5/3
y = -5/3
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